RP-SMA Extended Barrel RF Connectors TE Connectivity / Linx Technologies RP-SMA Extended Barrel RF Connectors are reverse-polarity connectors designed to meet FCC Part 15 requirements and are ideal for any application requiring a reliable non-standard RF connection. The reverse-polarity design uses the same tooling as a standard SMA, but reverses the center connection. The TE Connectivity / Linx Technologies RP-SMA series features an extended barrel to 0.756'.